Decrypting PPPoE Credentials from Router Configuration

I need someone to help me extract the PPPoE credentials from an encrypted configuration file of a consumer-grade router. I have full permission to access and modify the router's configuration. This is a personal project, and the goal is to retrieve the PPPoE username and password.

Key points:
- Full permission for router access: You'll be working with unrestricted access to the router's configuration, so you can get all the necessary information.
- Decryption of the configuration file: The file is encrypted, so you'll need to decrypt it to access the PPPoE credentials.
- Extraction of PPPoE credentials: The main task is to find the username and password for the PPPoE connection within the configuration file.

Ideal skills and experience:
- Proficiency in networking and router configuration: Strong understanding of consumer-grade routers and how to navigate and decrypt their configuration files.
- Experience with network security and encryption: Knowledge of encryption methods and tools to decrypt the router's configuration file.
- Familiarity with PPPoE: Understanding of the PPPoE protocol and how to identify, extract, and work with PPPoE credentials.